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It s when I m doing something low-level From my history, I worked on the deepest parts of BitBlt or the Smalltalk byte-code engine and those are very craftsman-like things And I had the luxury to do those over again a couple of times to get them really right and that s a craft Seibel: The difference I see between engineers and craftsmen is the engineers are the folks who say, We should be like the guys who build bridges Bridges don t fall down They have a repeatable engineering process The craftsmen say, This is more like woodworking The wood is unique every time and there are rules of thumb but no method that can guarantee certain results Ingalls: So in that regard I may be less of an engineer I think that the ways in which I stress systems are different.

The first assignment to P here sets the X coordinate to seven, leaving the Y coordinate unchanged; the second then sets the Y coordinate to five, leaving the X coordinate unchanged. The final result is thus that P contains the point with coordinates (7.0,5.0), as desired. Note carefully that, in contrast with the analogous example in the body of the chapter, we do not have to collect together the two constituent assignments in order to achieve the desired result. Why not Well, in order to answer this question, it helps to examine a more complex example: CREATE TYPE ELLIPSE AS ( A INTEGER, B INTEGER, CTR POINT ) ; DECLARE E ELLIPSE ; SET ( E.A, E.B ) = ROW ( 7, 3 ) ; For brevity, let s combine the two expansions this time. The overall result looks like this: BEGIN DECLARE TEMP ROW ( F1 SET TEMP = ROW ( 7, 3 SET E = E.A ( TEMP.F1 SET E = E.B ( TEMP.F2 END ; ..., F2 ... ) ; ) ; ) ; ) ;

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Figure 3-15 features a text box, a button, and some text. Users can replace the current text of the data placeholder by entering some text in the text box and clicking the button. The script then replaces the text in the data placeholder, as illustrated in Figure 3-16.

Now suppose the previous value of E had a = 10 and b = 8. Then the first assignment to E yields an ellipse with a = 7 and b = 8 in other words, an ellipse with a < b. However, this state of affairs does not cause a run-time error (and the second assignment to E thus goes on to yield an ellipse with a = 7 and b = 3, as required). Why is there no run-time error Because SQL is unaware of the type constraint to the effect that a must be greater than or equal to b (observe that the definition of type ELLIPSE included no such constraint); in fact, SQL doesn t support the concept of type constraints at all (we can t even state them). In our opinion, this lack of type constraint support on SQL s part constitutes a very serious flaw. While it does make it easier to support multiple assignment, as we ve just seen,21 it also means there are many real world types that can t be properly specified in SQL! For example, suppose we want to define a type called LENGTH (with the obvious meaning). Then we might specify, say, integers as the associated representation, and of course that specification does impose an a priori constraint on the values that go to make up the type. Considered as type constraints, however, such a priori constraints are extremely weak. In the case at hand, for example, there s no

I know there are people who do serious enterprise programming systems That s not a focus or a passion of mine Of the four you mentioned, the engineer is probably the least, then craftsman, and then this funny combination between artist and scientist at the top Seibel: You mentioned that you left industry for a while and then you came back Were you tired of computers or was it just other things in life Ingalls: It was other things in my life It was also a nice break, and I picked a good time for it, because when I came back, it didn t seem to me like things had changed that much, except everything was a hundred times faster..

21. As we ll see in the next subsection, however, it turns out (in another context) that SQL still has to do the same kind of thing we do anyway i.e., it still has to collect various constituent assignments together so it can hardly be argued that the fact that it doesn t have to do so in the case of multiple assignment is a significant advantage.

Dan Ingalls Seibel: Do you have any recommendations for people who want to be programmers Ingalls: Well, I think a decent course in computer science should be good The way I would organize that is to learn several different languages that have various different strengths Smalltalk s got a lot of strengths but it s not the answer to everything There s logic programming There s functional programming Actually, you can do Smalltalk in a functional style, and so that s covered there pretty much But like what I said about Lotus 1-2-3 and translating English to pig Latin, I think it s worth it to take several different computing environments and then pick a problem to solve in them, which either reveals the strength of the language or encourages you to somehow escape from it.

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